linux-kernel - Re: [PATCH 0/2] Send a SIGCHLD to the init's pid namespace parent when reboot

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Date:	Fri, 19 Aug 2011 17:24:16 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Daniel Lezcano <daniel.lezcano@...e.fr>
Cc:	"Serge E. Hallyn" <serge@...lyn.com>, akpm@...ux-foundation.org,
	bonbons@...ux-vserver.org, containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] Send a SIGCHLD to the init's pid namespace parent
	when reboot

On 08/19, Daniel Lezcano wrote:
>
> On 08/15/2011 04:47 PM, Oleg Nesterov wrote:
> >
> > 	- sys_reboot(cmd) does
> >
> > 		if (!global_namespace) {
> > 			task_active_pid_ns(current)->reboot_cmd = cmd;
> > 			sigkill_my_init();
> > 		}
>
> Hi Oleg,
>
> what would be your advice to get rid of from_ancestor_ns which prevent
> the signal to be delivered to the init process ?

Sure, a plain kill can't work. You can do force_sig_info(), this clears
SIGNAL_UNKILLABLE.

Hmm. But now I seem to recall we have other reasons to make the new
sigkill_task() helper... We will see. Anyway, force_ should work afaics.

Oleg.

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